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MathGroup Archive 1994

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Re: Nonlinear Discrete

  • To: mathgroup at yoda.physics.unc.edu
  • Subject: Re: Nonlinear Discrete
  • From: bert at netcom.com (Roberto Sierra)
  • Date: Thu, 3 Mar 1994 03:21:44 -0800

Norbert Scherm (<scherm at ifm.uni-hannover.de>) wrote:
<<
y[k_]:=0.5*y[k-1]+1*y[k-2]+y[k-1]*y[k-1];

-and-

y[i]=0.5*y[i-1]+1*y[i-2]+y[i-1]*y[i-1];
>>


Norbert is correct in everything state -- the one suggestion I
would have is to replace the term 0.5*y[k-1] (or 0.5*y[i-1]) with
y[k-1]/2 (or y[i-1]/2).  Though this may seem trivial, this has
ramifications when you're tring to find an exact value using integral
or rational numbers.

-- Roberto Sierra
   Tempered MicroDesigns
   San Francisco, CA





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